M1rrOR/TRiX,
I understand what you mean about your troubles with not knowing if you're talking to the right spirit. It's difficult to know for sure anything, you just have to trust yourself, and the spirit. Some spirits, like some of the goetic demons, are more difficult to summon, and constrain. Angels on the other, like the angels of the days of the week, are easily contacted. Read up on the spirits, and if you see that others easily contact the one you're interested in, then go with that feeling. Generally, other peoples experiences will coincide with yours. I've never worked with mepsitahl, so look for others that have, and compare notes.
The excercises in konstantinos book are taken from other books I think, like cunningham or bardon, so the techniques are good and known to work. I don't practice those things though, so I'm not very good with astral senses. Fasting for a few days, in combination with depriving yourself of sleep can do amazing things for your ability to hear and see spirits. I've fasted and deprived myself of sleep (none at all)for as much as 3 days and the results during an invocation and evocation are amazing. So do those things, as long as it doesn't cause you to get sick (like if you're diabetic, don't do that) and see how it works for you. The more evocations you do, the better your senses will get, and eventually you'll be able to activate them on command.
Doing daily affirmations also works well. Try this everyday, 3 or more times a day, for one month: "I can see and hear spirits at will". Say that to yourself or outloud, and especially during trance meditation as many times as you can remember to do it. That will send the message to your higher self and it will hear it eventually, and switch it on for you. We're like computers, with all the switches set to "off". I did that once but I got out of the habit of doing it, but for awhile I was able to see spirits sometimes, usually spontaniously, but it was working. I'm going to start doing it again soon.
Keep posting!
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